JP2748703B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner improved in defrosting.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a refrigerant circuit diagram of a conventional heat pump type air conditioner shown in Japanese Patent Application Publication No. JP-A-2005-260, in which 1 is a compressor, 2 is a condenser, 3 is a first on-off valve, 4 is a heat storage heat exchanger, and 5 is a 1 is a decompression device, 6 is an evaporator, 7 is a second on-off valve, 8 is a second decompression device, 9 is a third on-off valve, 10 is a fourth on-off valve, 12 is a defrost sensor, and 14 is a control device.

Next, the operation of the air conditioner will be described with reference to FIG. First, during the heating operation, the first and third on-off valves 3 and 9 are opened, the second and fourth on-off valves 7 and 10 are closed, and the refrigerant that has exited the condenser 2 passes through the heat storage heat exchanger 4 and passes through the heat storage heat exchanger 4. 1 From the pressure reducing device 5 to the evaporator 6,
By returning to the above, heat can be stored in the heat storage material by the refrigerant after sufficiently exerting the heating effect, and during the defrosting operation, the second and fourth on-off valves 7, 10 are opened, and the first and third on-off valves are opened. The valves 3 and 9 are closed, and the refrigerant that has exited the condenser 2 passes through the evaporator via the second on-off valve 7 and the second decompression device 8, passes through the first decompression device 5, and stores heat in the heat storage heat exchanger 4. Heat is supplied from the material and returns to the compressor 1 via the fourth on-off valve 10, so that heating and defrosting of the evaporator 6 can be performed simultaneously using the heat storage material as a heat source, and the defrost sensor 12 is provided. When the temperature reaches, for example, 3 ° C. or more, the defrosting operation is terminated.

[0004]

Since the conventional air conditioner is constructed as described above, if all the heat sources of the heat storage material are exhausted before the frost is completely melted during the defrosting operation, residual frost is generated. There was a problem of doing it.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to terminate the defrosting operation without residual frost even if all the heat sources of the heat storage material are exhausted during the defrosting operation. The purpose is to obtain an air conditioner that can be operated.

[0006]

An air conditioner according to the present invention comprises a compressor, a condenser, a first decompression device, and an evaporator in a sequential circuit, and includes a circuit between the condenser and the first decompression device. First
In a heat pump type air conditioner equipped with a heat storage heat exchanger incorporated in a heat storage tank together with an on-off valve and a heat storage material, a hot gas bypass circuit is provided between the discharge side of the compressor and the evaporator and the first pressure reducing device. A hot gas bypass circuit is provided by connecting an on-off valve, and a heat storage sensor is attached to the heat storage heat exchanger, and at the time of defrosting, a defrosting heating operation is performed using a heat source stored in the heat storage material. In addition, when the temperature of the heat storage sensor becomes equal to or lower than a predetermined temperature, the defrosting heating operation is terminated and the operation is switched to a hot gas bypass type defrosting operation.

A compressor, a condenser, a first decompression device and an evaporator are sequentially constituted by a circuit, and a first on-off valve, a second decompression device and a heat storage material are provided between the condenser and the first decompression device. In a heat pump type air conditioner having a heat storage heat exchanger built in a heat storage tank, a hot gas bypass circuit opening / closing valve is connected between the discharge side of the compressor and the evaporator and the first pressure reducing device. A hot gas bypass circuit is provided, and a heat storage sensor is attached to the heat storage heat exchanger, and at the time of defrosting, a defrost heating operation is performed using a heat source stored in the heat storage material, and the heat storage sensor is When the temperature becomes equal to or lower than a certain temperature, the defrosting heating operation is terminated and the operation is switched to a hot gas bypass type defrosting operation.

[0008]

According to the air conditioner of the present invention, even if the heat source of the heat storage material is exhausted in the defrosting operation using the heat storage, the defrosting operation can be completed by completely melting the frost without leaving any residual frost. While the defrosting operation is being performed using the heat source of the heat storage material, a circuit is configured to melt the frost of the evaporator and then receive heat from the heat storage heat exchanger.

In addition, even if the heat source of the heat storage material is exhausted in the defrosting operation using the heat storage, the frost can be completely melted and the defrosting operation can be completed without leaving residual frost. While the defrosting operation is being performed, a circuit for melting the frost of the evaporator after receiving heat from the heat storage heat exchanger is configured.

[0010]

Embodiment 1 First embodiment. An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a compressor, 2 is a condenser, 3 is a first on-off valve, 4
Is a heat storage heat exchanger for heat storage and heat release incorporated in the heat storage tank together with the heat storage material, 5 is a first pressure reducing device, 6 is an evaporator, and these constitute a first refrigerant circuit connected in series in order. Reference numeral 7 denotes a second on-off valve, and 8 denotes a second decompression device, which are sequentially connected in series and form a second refrigerant circuit in parallel with the first refrigerant circuit. Reference numeral 9 denotes a third on-off valve, which is connected to a portion where the first and second refrigerant circuits join at the outlet side of the evaporator 6 and a suction side of the compressor 1. Reference numeral 10 denotes a fourth on-off valve, which is connected to the third refrigerant circuit between the first on-off valve 3 and the heat storage heat exchanger 4 and between the third on-off valve 9 and the compressor 1. Reference numeral 11 denotes a hot gas bypass circuit opening / closing valve, which is connected to a fourth refrigerant circuit between the discharge side of the compressor 1 and the first pressure reducing device 5 and the evaporator 6 to constitute a hot gas bypass circuit.

Reference numeral 12 denotes a defrost sensor mounted near the outlet of the evaporator 6, 13 denotes a heat storage sensor mounted on the heat storage heat exchanger 4, and 14 denotes a control device, as shown in the system configuration block diagram of FIG. It is configured. That is, the microcomputer 15 includes a central processing unit 16, an input circuit 17, and an output circuit 18. The input circuit is connected to the defrost sensor 12 and the heat storage sensor 13, and the output circuit includes a first opening / closing valve 3, a second opening / closing valve. The valve 7, the third on-off valve 9, the fourth on-off valve 10, and the hot gas bypass circuit on-off valve 11 are connected respectively. 19 is a defrosting operation switch.

Next, the operation of the embodiment constructed as described above will be described with reference to the flowcharts of FIGS. 1 and 4 showing the flow of the defrosting operation. First, during the heating operation, the operation is the same as in the related art. If frost is formed, the defrosting heating operation using the heat storage is performed. That is, the second and fourth on-off valves 7, 10 open,
First, third, on-off valves 3, 9, of the hot gas bypass circuit,
11 is closed. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is sent to the condenser 2 to perform heating, and the frost adhering to the evaporator 6 due to the gas-liquid two-phase refrigerant having passed through the second on-off valve 7 and the second pressure reducing device 8 is removed. After being melted, the refrigerant liquid evaporates in the heat storage heat exchanger 4 via the first pressure reducing device 5 to become a refrigerant gas and returns to the compressor 1 through the fourth on-off valve 10. At this time, defrosting is terminated when the defrost sensor 12 reaches a certain temperature, for example, 3 ° C. or more. If the heat storage sensor 13 becomes 3 ° C. or less before the defrost sensor 12 becomes 3 ° C. or more, This means that there is no longer any heat source to melt the frost. Rather, if this operation is continued, frost will be formed again. Therefore, when the defrosting is not completed and the heat storage heat source is exhausted, the mode is switched to the hot gas bypass method. That is, third,
By opening the on-off valves 9 and 11 of the hot gas bypass circuit and closing the first, second and fourth on-off valves 3, 7, and 10, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is directly discharged to the evaporator. 6 to perform defrosting. Thus, the defrost sensor 1
When the temperature of 2 becomes 3 ° C. or more, the defrosting operation is terminated.

Second embodiment. In the above embodiment, during the defrosting operation, the frost adhering to the evaporator 6 is melted and then the heat is received by the heat storage heat exchanger 4, but as shown in FIG.
The same effect as described above can be obtained in a circuit for melting frost.

[0014]

As described above, according to the present invention, during defrosting, the defrosting and heating operation is performed using the heat source stored in the heat storage material. Since the frost heating operation is terminated and switched to the hot gas bypass defrosting operation, if the heat source of the heat storage material is used up before the frost is completely melted, the hot gas bypass type defrosting operation is performed. By doing so, the heating operation can be restarted after the frost is sufficiently melted, so that the heating operation time can be made longer, and as a result, the effect of improving comfort can be obtained.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram showing an air conditioner according to one embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 3 is a flowchart of the air conditioner according to one embodiment of the present invention.

FIG. 4 is a system configuration block diagram of an air conditioner according to an embodiment of the present invention.

FIG. 5 is a refrigerant circuit diagram showing a conventional air conditioner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compressor, 2 Condenser, 3 First on-off valve, 4
Heat storage heat exchanger, 5 first decompression device, 6 evaporator, 8
2nd decompression device, 11 hot gas bypass circuit on-off valve.

Claims (2)

(57) [Claims] 1. A compressor, a condenser, a first decompression device and an evaporator are sequentially constituted by a circuit, and are built in a heat storage tank together with a first on-off valve and a heat storage material between the condenser and the first decompression device. in heat pump type air conditioner including a heat storage heat exchanger, the discharge side of the compressor, the hot gas bypass circuit connects the hot gas bypass circuit opening and closing valve between the evaporator and the first decompressor A heat storage sensor attached to the heat storage heat exchanger, and the heat storage material is stored in the heat storage material during defrosting .
An air conditioner that performs a defrosting and heating operation using the heat source that has been heated, and terminates the defrosting and heating operation when the heat storage sensor falls below a certain temperature and switches to a hot gas bypass type defrosting operation. . 2. A compressor, a condenser, a first pressure reducing device, and an evaporator.
The condenser is constituted by a circuit in order, between the condenser and the first pressure reducing device.
In addition, the first on-off valve, the second decompression device, heat storage tank with heat storage material
Heat pump type air with heat storage heat exchanger built in
In the conditioner, the discharge side of the compressor and the evaporator
Hot gas bypass circuit on-off valve between the pressure reducing device and the first pressure reducing device
To provide a hot gas bypass circuit and
Equipped with a heat exchanger attached to the heat storage heat exchanger.
Performs defrost heating operation using the heat source stored in the heat storage material
When the temperature of the heat storage sensor falls below a certain temperature,
Finish the defrost heating operation and defrost the hot gas bypass system
An air conditioner characterized by switching to a reverse mode.